The efficiency improvement of fluorescent blue organic light-emitting diodes were investigated by inserting buffer layer. The OLED device using several buffer materials which have different HOMO and LUMO energy level were evaluated. The inserted buffer layer could control the effective hole injection and electron blocking, which leaded to remarkable high efficiency performance.
We proposed a new bidirectional gigabit wavelength division multiplexed/radio on fiber (WDM-RoF) system which
shares the same wavelength. A central station for downlink transmits a 3GHz wireless signal which is modulated
1.25Gbps by use of a mach-zehnder modulator. A base station for uplink a transmits 1.25Gbps down-converted wireless
signal by using a reflective semiconductor optical amplifier. We achieved a BER<10-9 of the downlink at -18.3dBm and
of the uplink at -22dBm after 20km transmission.
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